Appears to be a stack overflow: Top of stack dump (attached) shows it's a stack overflow
[ 22.163398] BUG: stack guard page was hit at (____ptrval____) (stack is (____ptrval____)..(____ptrval____)) [ 22.165204] kernel stack overflow (double-fault): 0000 [#1] SMP PTI [ 22.166729] CPU: 3 PID: 935 Comm: perf Not tainted 5.4.0-28-generic #32-Ubuntu [ 22.168813] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1 04/01/2014 [ 22.171263] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 [ 22.172769] Code: 83 ec 18 48 8b 5f 78 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 65 48 03 1d 00 0c f9 68 48 8b 87 80 00 00 00 48 85 c0 75 08 <48> 8b 03 48 85 c0 74 74 bf 24 00 00 00 48 8d 55 c4 48 8d 75 c8 e8 [ 22.176573] RSP: 0018:ffff978f00838020 EFLAGS: 00010046 [ 22.177569] RAX: 0000000000000000 RBX: ffffb78effdcab70 RCX: 0000000000000000 [ 22.178800] RDX: ffff978f008380b8 RSI: ffffb78effdcab70 RDI: ffffffff9863e620 [ 22.179993] RBP: ffff978f00838060 R08: 0000000000000000 R09: 0000000000000000 [ 22.181188] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff9863e620 [ 22.182698] R13: 0000000000000000 R14: ffffb78effdcab70 R15: ffff978f008380b8 [ 22.184019] FS: 00007ff4818af780(0000) GS:ffff892b7db80000(0000) knlGS:0000000000000000 [ 22.185592] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.186732] CR2: ffff978f00837ff8 CR3: 000000007d5d8000 CR4: 00000000000006e0 [ 22.188100] Call Trace: [ 22.188689] do_page_fault+0xca/0xe0 [ 22.189493] do_async_page_fault+0x39/0x70 [ 22.190388] async_page_fault+0x34/0x40 [ 22.191233] RIP: 0010:perf_trace_x86_exceptions+0x44/0xf0 ** Attachment added: "full stack dump" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941/+attachment/5363960/+files/stackdump.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875941 Title: using perf as root locks up focal kernel Status in Linux: Unknown Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: New Bug description: running sudo stress-ng --perf --cpu 1 -t 10 will cause the recent 5.4.0-25-generic kernel to lock up with no information on the console showing where it is locked up. Bisected this back to: commit d44d71bbb9618c526820b39fe1cd0673582dc8c4 (refs/bisect/bad) Author: Joerg Roedel <[email protected]> Date: Sat Mar 21 18:22:41 2020 -0700 x86/mm: split vmalloc_sync_all() BugLink: https://bugs.launchpad.net/bugs/1869061 commit 763802b53a427ed3cbd419dbba255c414fdd9e7c upstream. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1875941/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
